diff --git a/.github/workflows/black.yaml b/.github/workflows/black.yaml
new file mode 100644
index 00000000..0a6f9738
--- /dev/null
+++ b/.github/workflows/black.yaml
@@ -0,0 +1,45 @@
+name: Black Formatter
+
+on:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+      with:
+        ref: ${{ github.head_ref }}  # Check out the PR branch
+
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.12'
+
+    - name: Install Black
+      run: pip install black
+
+    - name: Run Black
+      run: black .
+
+    - name: Check for changes
+      id: changes
+      run: |
+        if [[ -n $(git status --porcelain) ]]; then
+          echo "changes_detected=true" >> $GITHUB_ENV
+        else
+          echo "changes_detected=false" >> $GITHUB_ENV
+        fi
+
+    - name: Commit changes
+      if: env.changes_detected == 'true'
+      run: |
+        git config --local user.name "github-actions[bot]"
+        git config --local user.email "github-actions[bot]@users.noreply.github.com"
+        git add .
+        git commit -m "chore: \`black .\`"
+        git push
diff --git a/eth_portfolio/_utils.py b/eth_portfolio/_utils.py
index f034c554..ccec74b1 100644
--- a/eth_portfolio/_utils.py
+++ b/eth_portfolio/_utils.py
@@ -258,8 +258,7 @@ async def _get_and_yield(
 
     @property
     @abstractmethod
-    def _start_block(self) -> int:
-        ...
+    def _start_block(self) -> int: ...
 
 
 _LT = TypeVar("_LT")
diff --git a/eth_portfolio/_ydb/token_transfers.py b/eth_portfolio/_ydb/token_transfers.py
index 1edf6d92..5f3ac246 100644
--- a/eth_portfolio/_ydb/token_transfers.py
+++ b/eth_portfolio/_ydb/token_transfers.py
@@ -44,8 +44,7 @@ def __repr__(self) -> str:
         return f"<{self.__class__.__module__}.{self.__class__.__name__} address={self.address}>"
 
     @abc.abstractproperty
-    def _topics(self) -> List:
-        ...
+    def _topics(self) -> List: ...
 
     @a_sync.ASyncIterator.wrap
     async def yield_thru_block(self, block) -> AsyncIterator["asyncio.Task[TokenTransfer]"]:
diff --git a/eth_portfolio/portfolio.py b/eth_portfolio/portfolio.py
index 2a72e4a7..709e23dc 100644
--- a/eth_portfolio/portfolio.py
+++ b/eth_portfolio/portfolio.py
@@ -174,7 +174,6 @@ def __init__(
         load_prices: bool = True,
         asynchronous: bool = False,
     ) -> None:
-
         """
         Initialize a Portfolio instance.
 
diff --git a/eth_portfolio/protocols/_base.py b/eth_portfolio/protocols/_base.py
index 3f22dd37..25e15b30 100644
--- a/eth_portfolio/protocols/_base.py
+++ b/eth_portfolio/protocols/_base.py
@@ -20,8 +20,7 @@ async def balances(self, address: Address, block: Optional[Block] = None) -> Tok
         return await self._balances(address, block=block)
 
     @abc.abstractmethod
-    async def _balances(self, address: Address, block: Optional[Block] = None) -> TokenBalances:
-        ...
+    async def _balances(self, address: Address, block: Optional[Block] = None) -> TokenBalances: ...
 
 
 class ProtocolWithStakingABC(ProtocolABC, metaclass=abc.ABCMeta):
diff --git a/eth_portfolio/protocols/lending/_base.py b/eth_portfolio/protocols/lending/_base.py
index 2e4a8fa2..58a7e007 100644
--- a/eth_portfolio/protocols/lending/_base.py
+++ b/eth_portfolio/protocols/lending/_base.py
@@ -22,8 +22,7 @@ async def debt(self, address: Address, block: Optional[Block] = None) -> TokenBa
         return await self._debt(address, block)  # type: ignore
 
     @abc.abstractmethod
-    async def _debt(self, address: Address, block: Optional[Block] = None) -> TokenBalances:
-        ...
+    async def _debt(self, address: Address, block: Optional[Block] = None) -> TokenBalances: ...
 
 
 class LendingProtocolWithLockedCollateral(LendingProtocol, ProtocolABC):
diff --git a/tests/_test_completeness.py b/tests/_test_completeness.py
index e602afdd..2de3ae89 100644
--- a/tests/_test_completeness.py
+++ b/tests/_test_completeness.py
@@ -1,6 +1,7 @@
 """
 This is temporarily disabled, might be removed
 """
+
 from typing import Callable
 
 import eth_portfolio.protocols.lending
diff --git a/tests/protocols/test_external.py b/tests/protocols/test_external.py
index 0f349755..c39aa68c 100644
--- a/tests/protocols/test_external.py
+++ b/tests/protocols/test_external.py
@@ -10,12 +10,10 @@
 SOME_OTHER_TOKEN = "0x0000000000000000000000000000000000000003"
 
 
-class MockProtocolA(AsyncMock):
-    ...
+class MockProtocolA(AsyncMock): ...
 
 
-class MockProtocolB(AsyncMock):
-    ...
+class MockProtocolB(AsyncMock): ...
 
 
 @patch("a_sync.map")
diff --git a/tests/test_typing.py b/tests/test_typing.py
index ffd7676a..fa6709b4 100644
--- a/tests/test_typing.py
+++ b/tests/test_typing.py
@@ -21,6 +21,7 @@
 WALLET_2 = "0x0000000000000000000000000000000000000006"
 WALLET_3 = "0x0000000000000000000000000000000000000007"
 
+
 # Test Balance class
 def test_balance_addition():
     b1 = Balance(balance=Decimal("10"), usd_value=Decimal("100"))